Williams Partners Reports Atlantic Sunrise Project on Track for Service This Summer

Williams Partners L.P. (NYSE: WPZ) today reported that construction is
nearing completion on the Atlantic Sunrise pipeline project – a critical
expansion of the existing Transco natural gas pipeline to connect
abundant Marcellus gas supplies with markets in the Mid-Atlantic and
Southeastern U.S.

The project sponsors report that the project is targeted for mechanical
completion beginning in August 2018, with full service (1.7 billion
cubic feet per day) anticipated to commence in the second half of August
2018, assuming timely receipt of the remaining regulatory approvals. A
portion of the mainline component of the project (550 million cubic feet
per day) has already been placed into service.

The mechanical completion date is based upon current contractor
schedules and may be affected by weather.

Greenfield construction on the Pennsylvania portion of the project began
in September 2017. The project has featured the installation of
approximately 200 miles of large diameter pipeline, two greenfield
compressor stations and compressor station modifications in five states.
The segment of the project known as the Central Penn Line will be
jointly owned by Transco and a third party.

The Federal Energy Regulatory Commission (FERC) authorized the project
in February 2017, concluding that environmental impacts associated with
the project would be reduced to “less than significant levels” with the
implementation of mitigation measures proposed by the company and FERC.

Williams Partners is an industry-leading, large-cap natural gas
infrastructure master limited partnership with a strong growth outlook
and major positions in key U.S. supply basins. Williams Partners has
operations across the natural gas value chain including gathering,
processing and interstate transportation of natural gas and natural gas
liquids. Williams Partners owns and operates more than 33,000 miles of
pipelines system wide – including the nation’s largest volume and
fastest growing pipeline – providing natural gas for clean-power
generation, heating and industrial use. Williams Partners’ operations
touch approximately 30 percent of U.S. natural gas. Tulsa, Okla.-based
Williams (NYSE: WMB), a premier provider of large-scale U.S. natural gas
infrastructure, owns approximately 74 percent of Williams Partners.

Portions of this document may constitute “forward-looking statements”
as defined by federal law. Although the partnership believes any such
statements are based on reasonable assumptions, there is no assurance
that actual outcomes will not be materially different. Additional
information about issues that could lead to material changes in
performance is contained in the partnership’s annual and quarterly
reports filed with the Securities and Exchange Commission.

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